Which of the following features were required for the the evolution of the amphibians?
A) notochord,vertebrae,jaws,bony skeleton,lungs and 4 limbs
B) notochord,vertebrae,jaws,bony skeleton,lungs and amniotic eggs
C) notochord,vertebrae,jaws,cartilaginous skeleton,lungs and 4 limbs
D) notochord,mammary glands,jaws,bony skeleton,lungs and 4 limbs
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